wornout

cliché

contraposition What does a 'wornout expression' mean?

Or a look on your face that makes you seem old and/or exhausted.

CJ

In the US this means an idiom or slang term that has gone out of fashion, or has been used so much that it has lost its impact. For example, the following:

flower child

egghead

burning the midnight oil

groovy

surfer girl

burn rubber